noun
immigration detention center
A facility where foreign nationals are held during immigration procedures, such as deportation or refugee status determination.
入国者収容所に収容されている外国人は、長期間の拘束に苦しんでいる。
Foreign nationals held in immigration detention centers suffer from prolonged confinement.
収容所 is a general term for a detention facility or camp, while 入国者収容所 specifically refers to an immigration detention center.
Compound of 入国者 (immigrant, entrant) and 収容所 (detention facility).